Abstract
In the peculiar type of spermateleosis briefly described in 10 stages, the spermatid nucleus progressively elongates and is finally transformed directly into the mature ‘all head’ spermatozoon. A cytoplasmic ‘tail’, which appeared in the early spermatid and grew to a considerable length, was later discarded. No nuclear material was ever observed in the ‘tail’ and all the cytoplasm of the spermatid was lost except that which later formed the delicate membrane of the mature spermatozoon and the short tail remnant.
